Is there any special way for variable++?

[typingcat@gmail.com]

Say I have a table in a MySQL server
ID USERNAME COUNT
0 JOHN 2
1 JANE 3
2 HOMER 3
3 MOE 2

If I want to increase Homer's count by 1,
The plain way would be;
1)$TEMP=SELECT COUNT WHERE ID=2
2)$TEMP++
2)UPDATE .. SET COUNT=$temp...
I guess if there is any special way to increase the int value by one?
For increasing 1 is so commonly used (that's why c,c++,java,C# has the
operator ++).

[Ewoud Dronkert]

Re: Is there any special way for variable++?

typingcat@gmail .com wrote:
[color=blue]
> Say I have a table in a MySQL server
> ID USERNAME COUNT
> 0 JOHN 2
> 1 JANE 3
> 2 HOMER 3
> 3 MOE 2[/color]

Generally, it's a bad idea to give a column a name that is also a sql
preserved word (count).
[color=blue]
> If I want to increase Homer's count by 1,
> The plain way would be;
> 1)$TEMP=SELECT COUNT WHERE ID=2
> 2)$TEMP++
> 2)UPDATE .. SET COUNT=$temp...[/color]

No, you would let the database do the work:

UPDATE Tablename SET count=count+1 WHERE id=2

May need `` around count, because of problem mentioned above. See
http://php.net/mysql-query and

http://dev.mysql.com/doc/refman/4.1/en/update.html

[color=blue]
> I guess if there is any special way to increase the int value by one?
> For increasing 1 is so commonly used (that's why c,c++,java,C# has the
> operator ++).[/color]

Yes, that operator also exists in PHP:

http://php.net/manual/en/language.operators.increment.php

--
E. Dronkert

[jkimball4@gmail.com]

Re: Is there any special way for variable++?

you can do this in the mysql itself depending on what server version
you are using. try update .. set count=count+1 where id=2 and
username="homer ";

typingcat@gmail .com wrote:[color=blue]
> Say I have a table in a MySQL server
> ID USERNAME COUNT
> 0 JOHN 2
> 1 JANE 3
> 2 HOMER 3
> 3 MOE 2
>
> If I want to increase Homer's count by 1,
> The plain way would be;
> 1)$TEMP=SELECT COUNT WHERE ID=2
> 2)$TEMP++
> 2)UPDATE .. SET COUNT=$temp...
> I guess if there is any special way to increase the int value by one?
> For increasing 1 is so commonly used (that's why c,c++,java,C# has the
> operator ++).[/color]